21. If the mass of an object is 35 grams and it takes up 7 cms of space, calculate the density. 22. Convert 4.5 hours to seconds a.15,200 seconds b.16,200 seconds c. 17,200 seconds d. 18,200 seconds 23. It is a measure of how tightly packed and how heavy the molecules are in an object. a. Density b. mass c. Weight d. Pressure 24. A neurotic tiger shark starts from rest and speeds up uni- formly to 12 meters per second in a time of 3 seconds. What was the magnitude of the average acceleration in meter per second of the tiger shark? a.1 b.2 c.4 d.3 25. An airplane accelerates down a runway at 3.2m/52 for 32.85 until is finally lifts off the ground. Determine the distance trav- eled before takeoff in meters a. 1721 b.1731 c. 1741 d.1751 26. The slowest animal ever discovered is a crab found in the Red Sea that travels an average speed of 5.7km/year. How long will it take this crab to travel 1m. a. 82 minutes b. 92 minutes c. 102 minutes d. 112 minutes 27. It is defined as the magnitude and direction of the straight line joining one's starting point to one's final point a. Displacement b. Distance c. Speed d. Momentum d. Attraction 28. A form of energy made up of charges that can produce light, heat, or motion 32. It is an object that acts like magnets when an electric cur- a. Electricity rent passes through them b. Temperature a. electromagnets c. Heat b. battery d. Pressure c. electric cable d. magnets 29. Which of the following is not a unit of pressure? 33. Which is not a property of magnet? a. Torr a. Property of Direction b. psi b. Property of Attraction c. Pascal c. Property of Repulsion d. Fahrenheit d. Property of Creation 30. Which of the following is not a shape of magnet? 34. In transverse waves, Particles move parallel to the motion of the wave a. rectangular magnet b. bar magnet c. Horseshoe magnet d. Circular Magnet a. True b. False 35. X-rays is not a type of electromagnetic waves. a. True 31. A magnet create an invisible area of magnetism called b. False what? a. magnetic field b. magnetic area c. magnetization 36. Mechanical Waves require the particles of the medium to vibrate in order for energy to be transferred. a. True b. False 37. The time it takes a wave to travel a distance equal to a wavelength a. Period b. Wavelength c. Decibels d. Frequency 38. The bending of a waves as it moves around an obstacle or passes through a narrow opening. a. Diffraction b. Refraction c. Reflection d. Magnetization 39. When one object vibrates another without touching. a. Resonance b. Polarization c. Refraction d. Diffraction